Changing company name (including e-mail address domain names)

My company is in the process of changing its name and will likewise change all its e-mail adressess to match the new name of the company.

So lets say that I have 70 devices today activated with a bbx.com domain mail address and we want to change our name (and domains to bb10.com) - would there be any need for changes on the BES server or will the devices have to be reactivated, or is it enough to set the new domain as primary per user in AD for the BB phones to use the new domain as a sender address?